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open5gs/src/upf/gtp-path.c

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/*
* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "context.h"
#if HAVE_NETINET_IP_H
#include <netinet/ip.h>
#endif
#if HAVE_NETINET_IP6_H
#include <netinet/ip6.h>
#endif
#if HAVE_NETINET_IP_ICMP_H
#include <netinet/ip_icmp.h>
#endif
#if HAVE_NETINET_ICMP6_H
#include <netinet/icmp6.h>
#endif
#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#if HAVE_NET_IF_DL_H
#include <net/if_dl.h>
#endif
#if HAVE_IFADDRS_H
#include <ifaddrs.h>
#endif
#include "arp-nd.h"
#include "event.h"
#include "gtp-path.h"
#include "pfcp-path.h"
#include "rule-match.h"
#define UPF_GTP_HANDLED 1
const uint8_t proxy_mac_addr[] = { 0x0e, 0x00, 0x00, 0x00, 0x00, 0x01 };
static ogs_pkbuf_pool_t *packet_pool = NULL;
static void upf_gtp_handle_multicast(ogs_pkbuf_t *recvbuf);
static uint16_t _get_eth_type(uint8_t *data, uint len) {
if (len > ETHER_HDR_LEN) {
struct ether_header *hdr = (struct ether_header*)data;
return htobe16(hdr->ether_type);
}
return 0;
}
static void _gtpv1_tun_recv_common_cb(short when, ogs_socket_t fd, bool has_eth, void *data)
{
ogs_pkbuf_t *recvbuf = NULL;
upf_sess_t *sess = NULL;
ogs_pfcp_pdr_t *pdr = NULL;
ogs_pfcp_pdr_t *fallback_pdr = NULL;
ogs_pfcp_far_t *far = NULL;
ogs_pfcp_user_plane_report_t report;
recvbuf = ogs_tun_read(fd, packet_pool);
if (!recvbuf) {
ogs_warn("ogs_tun_read() failed");
return;
}
if (has_eth) {
ogs_pkbuf_t *replybuf = NULL;
uint16_t eth_type = _get_eth_type(recvbuf->data, recvbuf->len);
if (eth_type == ETHERTYPE_ARP) {
if (is_arp_req(recvbuf->data, recvbuf->len)) {
replybuf = ogs_pkbuf_alloc(packet_pool, OGS_MAX_PKT_LEN);
ogs_assert(replybuf);
ogs_pkbuf_reserve(replybuf, OGS_TUN_MAX_HEADROOM);
ogs_pkbuf_put(replybuf, OGS_MAX_PKT_LEN-OGS_TUN_MAX_HEADROOM);
arp_reply(replybuf->data, recvbuf->data, recvbuf->len, proxy_mac_addr);
ogs_debug("[SEND] reply to ARP request");
} else {
goto cleanup;
}
} else if (eth_type == ETHERTYPE_IPV6 && is_nd_req(recvbuf->data, recvbuf->len)) {
replybuf = ogs_pkbuf_alloc(packet_pool, OGS_MAX_PKT_LEN);
ogs_assert(replybuf);
ogs_pkbuf_reserve(replybuf, OGS_TUN_MAX_HEADROOM);
ogs_pkbuf_put(replybuf, OGS_MAX_PKT_LEN-OGS_TUN_MAX_HEADROOM);
nd_reply(replybuf->data, recvbuf->data, recvbuf->len, proxy_mac_addr);
ogs_debug("[SEND] reply to ND solicit");
}
if (replybuf) {
if (ogs_tun_write(fd, replybuf) != OGS_OK)
ogs_warn("ogs_tun_write() for reply failed");
goto cleanup;
}
if (eth_type != ETHERTYPE_IP && eth_type != ETHERTYPE_IPV6) {
ogs_error("[DROP] Invalid eth_type [%x]]", eth_type);
ogs_log_hexdump(OGS_LOG_ERROR, recvbuf->data, recvbuf->len);
goto cleanup;
}
ogs_pkbuf_pull(recvbuf, ETHER_HDR_LEN);
}
sess = upf_sess_find_by_ue_ip_address(recvbuf);
if (!sess)
goto cleanup;
ogs_list_for_each(&sess->pfcp.pdr_list, pdr) {
far = pdr->far;
ogs_assert(far);
/* Check if PDR is Downlink */
if (pdr->src_if != OGS_PFCP_INTERFACE_CORE)
continue;
/* Save the Fallback PDR : Lowest precedence downlink PDR */
fallback_pdr = pdr;
/* Check if FAR is Downlink */
if (far->dst_if != OGS_PFCP_INTERFACE_ACCESS)
continue;
/* Check if Outer header creation */
if (far->outer_header_creation.ip4 == 0 &&
far->outer_header_creation.ip6 == 0 &&
far->outer_header_creation.udp4 == 0 &&
far->outer_header_creation.udp6 == 0 &&
far->outer_header_creation.gtpu4 == 0 &&
far->outer_header_creation.gtpu6 == 0)
continue;
/* Check if Rule List in PDR */
if (ogs_list_first(&pdr->rule_list) &&
ogs_pfcp_pdr_rule_find_by_packet(pdr, recvbuf) == NULL)
continue;
break;
}
if (!pdr)
pdr = fallback_pdr;
if (!pdr) {
if (ogs_app()->parameter.multicast) {
upf_gtp_handle_multicast(recvbuf);
}
goto cleanup;
}
ogs_pfcp_up_handle_pdr(pdr, recvbuf, &report);
if (report.type.downlink_data_report) {
ogs_assert(pdr->sess);
sess = UPF_SESS(pdr->sess);
ogs_assert(sess);
report.downlink_data.pdr_id = pdr->id;
if (pdr->qer && pdr->qer->qfi)
report.downlink_data.qfi = pdr->qer->qfi; /* for 5GC */
ogs_assert(OGS_OK ==
upf_pfcp_send_session_report_request(sess, &report));
}
cleanup:
ogs_pkbuf_free(recvbuf);
}
static void _gtpv1_tun_recv_cb(short when, ogs_socket_t fd, void *data) {
_gtpv1_tun_recv_common_cb(when, fd, false, data);
}
static void _gtpv1_tun_recv_eth_cb(short when, ogs_socket_t fd, void *data) {
_gtpv1_tun_recv_common_cb(when, fd, true, data);
}
static void _gtpv1_u_recv_cb(short when, ogs_socket_t fd, void *data)
{
int len;
ssize_t size;
char buf[OGS_ADDRSTRLEN];
upf_sess_t *sess = NULL;
ogs_pkbuf_t *pkbuf = NULL;
ogs_sockaddr_t from;
ogs_gtp_header_t *gtp_h = NULL;
ogs_pfcp_user_plane_report_t report;
uint32_t teid;
uint8_t qfi;
ogs_assert(fd != INVALID_SOCKET);
pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_PKT_LEN);
ogs_assert(pkbuf);
ogs_pkbuf_reserve(pkbuf, OGS_TUN_MAX_HEADROOM);
ogs_pkbuf_put(pkbuf, OGS_MAX_PKT_LEN-OGS_TUN_MAX_HEADROOM);
size = ogs_recvfrom(fd, pkbuf->data, pkbuf->len, 0, &from);
if (size <= 0) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_recv() failed");
goto cleanup;
}
ogs_pkbuf_trim(pkbuf, size);
ogs_assert(pkbuf);
ogs_assert(pkbuf->len);
gtp_h = (ogs_gtp_header_t *)pkbuf->data;
if (gtp_h->version != OGS_GTP_VERSION_1) {
ogs_error("[DROP] Invalid GTPU version [%d]", gtp_h->version);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
if (gtp_h->type == OGS_GTPU_MSGTYPE_ECHO_REQ) {
ogs_pkbuf_t *echo_rsp;
ogs_debug("[RECV] Echo Request from [%s]", OGS_ADDR(&from, buf));
echo_rsp = ogs_gtp_handle_echo_req(pkbuf);
if (echo_rsp) {
ssize_t sent;
/* Echo reply */
ogs_debug("[SEND] Echo Response to [%s]", OGS_ADDR(&from, buf));
sent = ogs_sendto(fd, echo_rsp->data, echo_rsp->len, 0, &from);
if (sent < 0 || sent != echo_rsp->len) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_sendto() failed");
}
ogs_pkbuf_free(echo_rsp);
}
goto cleanup;
}
teid = be32toh(gtp_h->teid);
ogs_debug("[RECV] GPU-U Type [%d] from [%s] : TEID[0x%x]",
gtp_h->type, OGS_ADDR(&from, buf), teid);
qfi = 0;
if (gtp_h->flags & OGS_GTPU_FLAGS_E) {
/*
* TS29.281
* 5.2.1 General format of the GTP-U Extension Header
* Figure 5.2.1-3: Definition of Extension Header Type
*
* Note 4 : For a GTP-PDU with several Extension Headers, the PDU
* Session Container should be the first Extension Header
*/
ogs_gtp_extension_header_t *extension_header =
(ogs_gtp_extension_header_t *)(pkbuf->data + OGS_GTPV1U_HEADER_LEN);
ogs_assert(extension_header);
if (extension_header->type ==
OGS_GTP_EXTENSION_HEADER_TYPE_PDU_SESSION_CONTAINER) {
if (extension_header->pdu_type ==
OGS_GTP_EXTENSION_HEADER_PDU_TYPE_UL_PDU_SESSION_INFORMATION) {
ogs_debug(" QFI [0x%x]",
extension_header->qos_flow_identifier);
qfi = extension_header->qos_flow_identifier;
}
}
}
/* Remove GTP header and send packets to TUN interface */
len = ogs_gtpu_header_len(pkbuf);
if (len < 0) {
ogs_error("[DROP] Cannot decode GTPU packet");
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
goto cleanup;
}
ogs_assert(ogs_pkbuf_pull(pkbuf, len));
if (gtp_h->type == OGS_GTPU_MSGTYPE_END_MARKER) {
/* Nothing */
} else if (gtp_h->type == OGS_GTPU_MSGTYPE_ERR_IND) {
ogs_pfcp_far_t *far = NULL;
far = ogs_pfcp_far_find_by_error_indication(pkbuf);
if (far) {
ogs_pfcp_up_handle_error_indication(far, &report);
if (report.type.error_indication_report) {
ogs_assert(far->sess);
sess = UPF_SESS(far->sess);
ogs_assert(sess);
ogs_assert(OGS_OK ==
upf_pfcp_send_session_report_request(sess, &report));
}
} else {
ogs_error("[DROP] Cannot find FAR by Error-Indication");
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
}
} else if (gtp_h->type == OGS_GTPU_MSGTYPE_GPDU) {
struct ip *ip_h = NULL;
ogs_pfcp_object_t *pfcp_object = NULL;
ogs_pfcp_sess_t *pfcp_sess = NULL;
ogs_pfcp_pdr_t *pdr = NULL;
ogs_pfcp_far_t *far = NULL;
ogs_pfcp_subnet_t *subnet = NULL;
ogs_pfcp_dev_t *dev = NULL;
ip_h = (struct ip *)pkbuf->data;
ogs_assert(ip_h);
pfcp_object = ogs_pfcp_object_find_by_teid(teid);
if (!pfcp_object) {
/* TODO : Send Error Indication */
goto cleanup;
}
switch(pfcp_object->type) {
case OGS_PFCP_OBJ_PDR_TYPE:
pdr = (ogs_pfcp_pdr_t *)pfcp_object;
ogs_assert(pdr);
break;
case OGS_PFCP_OBJ_SESS_TYPE:
pfcp_sess = (ogs_pfcp_sess_t *)pfcp_object;
ogs_assert(pfcp_sess);
ogs_list_for_each(&pfcp_sess->pdr_list, pdr) {
/* Check if Source Interface */
if (pdr->src_if != OGS_PFCP_INTERFACE_ACCESS &&
pdr->src_if != OGS_PFCP_INTERFACE_CP_FUNCTION)
continue;
/* Check if TEID */
if (teid != pdr->f_teid.teid)
continue;
/* Check if QFI */
if (qfi && pdr->qfi != qfi)
continue;
/* Check if Rule List in PDR */
if (ogs_list_first(&pdr->rule_list) &&
ogs_pfcp_pdr_rule_find_by_packet(pdr, pkbuf) == NULL)
continue;
break;
}
if (!pdr) {
/* TODO : Send Error Indication */
goto cleanup;
}
break;
default:
ogs_fatal("Unknown type [%d]", pfcp_object->type);
ogs_assert_if_reached();
}
ogs_assert(pdr);
ogs_assert(pdr->sess);
ogs_assert(pdr->sess->obj.type == OGS_PFCP_OBJ_SESS_TYPE);
sess = UPF_SESS(pdr->sess);
ogs_assert(sess);
far = pdr->far;
ogs_assert(far);
if (far->dst_if == OGS_PFCP_INTERFACE_CORE) {
uint16_t eth_type = 0;
if (ip_h->ip_v == 4 && sess->ipv4) {
subnet = sess->ipv4->subnet;
eth_type = ETHERTYPE_IP;
} else if (ip_h->ip_v == 6 && sess->ipv6) {
subnet = sess->ipv6->subnet;
eth_type = ETHERTYPE_IPV6;
}
if (!subnet) {
#if 0 /* It's redundant log message */
ogs_error("[DROP] Cannot find subnet V:%d, IPv4:%p, IPv6:%p",
ip_h->ip_v, sess->ipv4, sess->ipv6);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
#endif
goto cleanup;
}
dev = subnet->dev;
ogs_assert(dev);
if (dev->is_tap) {
ogs_assert(eth_type);
eth_type = htobe16(eth_type);
ogs_pkbuf_push(pkbuf, sizeof(eth_type));
memcpy(pkbuf->data, &eth_type, sizeof(eth_type));
ogs_pkbuf_push(pkbuf, ETHER_ADDR_LEN);
memcpy(pkbuf->data, proxy_mac_addr, ETHER_ADDR_LEN);
ogs_pkbuf_push(pkbuf, ETHER_ADDR_LEN);
memcpy(pkbuf->data, dev->mac_addr, ETHER_ADDR_LEN);
}
/* TODO: if destined to another UE, hairpin back out. */
if (ogs_tun_write(dev->fd, pkbuf) != OGS_OK)
ogs_warn("ogs_tun_write() failed");
} else if (far->dst_if == OGS_PFCP_INTERFACE_ACCESS) {
ogs_pfcp_up_handle_pdr(pdr, pkbuf, &report);
if (report.type.downlink_data_report) {
ogs_error("Indirect Data Fowarding Buffered");
report.downlink_data.pdr_id = pdr->id;
if (pdr->qer && pdr->qer->qfi)
report.downlink_data.qfi = pdr->qer->qfi; /* for 5GC */
ogs_assert(OGS_OK ==
upf_pfcp_send_session_report_request(sess, &report));
}
} else if (far->dst_if == OGS_PFCP_INTERFACE_CP_FUNCTION) {
if (!far->gnode) {
ogs_error("No Outer Header Creation in FAR");
goto cleanup;
}
if ((far->apply_action & OGS_PFCP_APPLY_ACTION_FORW) == 0) {
ogs_error("Not supported Apply Action [0x%x]",
far->apply_action);
goto cleanup;
}
ogs_pfcp_up_handle_pdr(pdr, pkbuf, &report);
ogs_assert(report.type.downlink_data_report == 0);
} else {
ogs_fatal("Not implemented : FAR-DST_IF[%d]", far->dst_if);
ogs_assert_if_reached();
}
} else {
ogs_error("[DROP] Invalid GTPU Type [%d]", gtp_h->type);
ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
}
cleanup:
ogs_pkbuf_free(pkbuf);
}
int upf_gtp_init(void)
{
ogs_pkbuf_config_t config;
memset(&config, 0, sizeof config);
config.cluster_2048_pool = ogs_app()->pool.packet;
packet_pool = ogs_pkbuf_pool_create(&config);
return OGS_OK;
}
void upf_gtp_final(void)
{
ogs_pkbuf_pool_destroy(packet_pool);
}
static void _get_dev_mac_addr(char *ifname, uint8_t *mac_addr)
{
#ifdef SIOCGIFHWADDR
int fd = socket(PF_INET, SOCK_DGRAM, 0);
ogs_assert(fd);
struct ifreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_name, ifname, IF_NAMESIZE-1);
ogs_assert(ioctl(fd, SIOCGIFHWADDR, &req) == 0);
memcpy(mac_addr, req.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
#else
struct ifaddrs *ifap;
ogs_assert(getifaddrs(&ifap) == 0);
struct ifaddrs *p;
for (p = ifap; p; p = p->ifa_next) {
if (strncmp(ifname, p->ifa_name, IF_NAMESIZE-1) == 0) {
struct sockaddr_dl* sdp = (struct sockaddr_dl*) p->ifa_addr;
memcpy(mac_addr, sdp->sdl_data + sdp->sdl_nlen, ETHER_ADDR_LEN);
freeifaddrs(ifap);
return;
}
}
ogs_assert(0); /* interface not found. */
#endif
}
int upf_gtp_open(void)
{
ogs_pfcp_dev_t *dev = NULL;
ogs_pfcp_subnet_t *subnet = NULL;
ogs_socknode_t *node = NULL;
ogs_sock_t *sock = NULL;
int rc;
ogs_list_for_each(&ogs_gtp_self()->gtpu_list, node) {
sock = ogs_gtp_server(node);
if (!sock) return OGS_ERROR;
if (sock->family == AF_INET)
ogs_gtp_self()->gtpu_sock = sock;
else if (sock->family == AF_INET6)
ogs_gtp_self()->gtpu_sock6 = sock;
node->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, sock->fd, _gtpv1_u_recv_cb, sock);
ogs_assert(node->poll);
}
OGS_SETUP_GTPU_SERVER;
/* NOTE : tun device can be created via following command.
*
* $ sudo ip tuntap add name ogstun mode tun
*
* Also, before running upf, assign the one IP from IP pool of UE
* to ogstun. The IP should not be assigned to UE
*
* $ sudo ifconfig ogstun 45.45.0.1/16 up
*
*/
/* Open Tun interface */
ogs_list_for_each(&ogs_pfcp_self()->dev_list, dev) {
dev->is_tap = strstr(dev->ifname, "tap");
dev->fd = ogs_tun_open(dev->ifname, OGS_MAX_IFNAME_LEN, dev->is_tap);
if (dev->fd == INVALID_SOCKET) {
ogs_error("tun_open(dev:%s) failed", dev->ifname);
return OGS_ERROR;
}
if (dev->is_tap) {
_get_dev_mac_addr(dev->ifname, dev->mac_addr);
dev->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, dev->fd, _gtpv1_tun_recv_eth_cb, NULL);
} else {
dev->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, dev->fd, _gtpv1_tun_recv_cb, NULL);
}
ogs_assert(dev->poll);
}
/*
* On Linux, it is possible to create a persistent tun/tap
* interface which will continue to exist even if open5gs quit,
* although this is normally not required.
* It can be useful to set up a tun/tap interface owned
* by a non-root user, so open5gs can be started without
* needing any root privileges at all.
*/
/* Set P-to-P IP address with Netmask
* Note that Linux will skip this configuration */
ogs_list_for_each(&ogs_pfcp_self()->subnet_list, subnet) {
ogs_assert(subnet->dev);
rc = ogs_tun_set_ip(subnet->dev->ifname, &subnet->gw, &subnet->sub);
if (rc != OGS_OK) {
ogs_error("ogs_tun_set_ip(dev:%s) failed", subnet->dev->ifname);
return OGS_ERROR;
}
}
/* Link-Local Address for UPF_TUN */
ogs_list_for_each(&ogs_pfcp_self()->dev_list, dev)
dev->link_local_addr = ogs_link_local_addr_by_dev(dev->ifname);
return OGS_OK;
}
void upf_gtp_close(void)
{
ogs_pfcp_dev_t *dev = NULL;
ogs_socknode_remove_all(&ogs_gtp_self()->gtpu_list);
ogs_list_for_each(&ogs_pfcp_self()->dev_list, dev) {
if (dev->poll)
ogs_pollset_remove(dev->poll);
ogs_closesocket(dev->fd);
}
}
static void upf_gtp_handle_multicast(ogs_pkbuf_t *recvbuf)
{
struct ip *ip_h = NULL;
struct ip6_hdr *ip6_h = NULL;
ogs_pfcp_user_plane_report_t report;
ip_h = (struct ip *)recvbuf->data;
if (ip_h->ip_v == 6) {
#if COMPILE_ERROR_IN_MAC_OS_X /* Compiler error in Mac OS X platform */
ip6_h = (struct ip6_hdr *)recvbuf->data;
if (IN6_IS_ADDR_MULTICAST(&ip6_h->ip6_dst))
#else
struct in6_addr ip6_dst;
ip6_h = (struct ip6_hdr *)recvbuf->data;
memcpy(&ip6_dst, &ip6_h->ip6_dst, sizeof(struct in6_addr));
if (IN6_IS_ADDR_MULTICAST(&ip6_dst))
#endif
{
upf_sess_t *sess = NULL;
/* IPv6 Multicast */
ogs_list_for_each(&upf_self()->sess_list, sess) {
if (sess->ipv6) {
/* PDN IPv6 is avaiable */
ogs_pfcp_pdr_t *pdr = NULL;
ogs_list_for_each(&sess->pfcp.pdr_list, pdr) {
if (pdr->src_if == OGS_PFCP_INTERFACE_CORE) {
ogs_pfcp_up_handle_pdr(pdr, recvbuf, &report);
break;
}
}
return;
}
}
}
}
}
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